Warp beam brake



N0. 610,784. Patented Sept I3, |898. H. WOLF.

WARP BEAM BRAKE.

(Application filed Dec. 24, 1897.)

(No Model.) 3 Sheets-Sheet l.-

Patented Sep. I3, |898.

No. 6l0,784.

H. WDLFM.

WARP BEAM BRAKE.

(Application l'ed Dec. 24, 1897.)

3 Sheets-Sheet 2.

(No Model.)

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N0. 6|0,784. Patented Sept. I3, |898.

H. WOLF.

WARP BEAM BRAKE.

(Application led Dec. 24, 1897.) (No Model.)

3 Sheets-Sheet 3.

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HERMANN WOLF, OF LODZ, RUSSIA.

wARP-BEAM BRAKE.

SPECIFICATION forming part of Letters Patent No. 610,784, dated September 13, 1898.

Application filed December 24, 1897. Serial No. 663,372. (No model.) Iratentedin France February 20, 1897, No. 264,278.

To all whom t may concern:

Be itknown that I, HERMANN VOLF, engineer, a citizen of the Republic of Switzerland, residing at 17 Karlstrasse, Lodz, in the Empire of Russia, have invented certain new and useful Improvements in lVarp-Beam Brakes, (for which Letters Patent have been obtained in'France, No. 264,278, dated February 20, 1897 and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings,and toiigures of reference marked thereon, which form a part of this specification.

My invention has for its object improvements in let-off motions for looms, wherein a brake clog or shoe operated by the tension of the warp on the whip-roll is caused to cooperate with a stationary clog or shoe to regulate the speed of rotation of the warp-beam relatively to that of the cloth-beam or relatively to the speed of the loom.

In the accompanying drawings, Figure 1is a fragmentary side elevation, Fig. 2 a like front elevation, and Fig. 3 a fragmentary plan, of so much of a loom as will be necessary to illustrate my invention.

The let-ofE motion comprises a movable brake clog or shoe 6, controlled by variations in the tension of the warp yarns or threads on the whip-roll 19, said shoe G cooperating with another shoe 5, that has a iixed relation relatively to the said shoe 6.

The Warp-beam is journaled, as usual, in the loom-framing 1. The fixed shoe 5, which serves as a bearing for the Warp-beam, is seated on or secured to a holder or saddle 3, that is or may be adjustably secured to the loom-framing 1. The movable brake-shoe G, which inthe let-off motion illustrated in the drawings is arranged above the Warp-beam 2, is secured to a holder 4, that has pivotal connection at 7 with and in the channel of a rail 7a and is held down on the warp-beam by a spring 9. The spring 9 is mounted on a rod 10 and has bearing at one end against a loose collar 12a, held in position by a composite nut 12, screwed to the upper end of said rod,

which is mounted a spring 22.

sleeve 21 has bearing on a Xed arm or pro- 65 and at the other end said spring has bearing on an arm 4 of theholder or brake-beam 4, to which the shoe 6 is secured in any desired manner. The rod 10 passes loosely through an opening or slot in the arm 4a of the brake- 55 beam 4 and has its lower end slotted for the passage of a pin 11 on a projection from the saddle 3 for the fixed brake-shoe 5.

The whip-roll 19 is journaled in the outer ends of levers 16, pivoted at 17 to the loom- 6o frame 1. To one of said levers is pivoted a push-rod 15, that carries aloose sleeve and a fast collar 21 and 23, respectively, between The loose jection 20 on the loom-frame, while the rod l15 is stepped in one of the arms 14I of a twoarmed rock-lever 14, in the other arm, 14e, of which is stepped a rod 13, pivoted to the larm 4, projecting from thebrake-beam 4 for the 7o brake-shoe' G.

It is obvious that whenever the tension of the warp from the warp-beam increases beyond a normal tension-that is to say, whenever the tension of the warp exceeds the tension of spring 22 on rodl-the whip-roll 19 will be drawn downward, thereby depressing the rod 15 against the stress of its spring 22, in consequence of which the lever 14 will be rocked, thereby lifting the rod 13 and there- 8o through the brake-beam 4 against the stress of its spring 9, thus relieving the warp-beam 2 of more or less of the brake action of brake 6. As soon as the whip-roll is relieved from abnormal stress thereon of the warp the parts 8 5 return to their normal position, as will be readily understood. The spring 22 on pushrod 15 acts as a support and counterbalance for the whip-roll and its levers 16. By means of the nut 12 on rod 10 the action of the brake- 9o In practice the described let-off motion will be applied to both ends of the warp-beam 2, though this is not absolutely necessary.

Inasmuch as a sudden variation of the tension of the warp-threads does not ordinarily loo take place, such variations on the contrary taking place gradually and in accordance with the graduallydiminishing diameter of the warp-beam, it is obvious that the self-acting let-off mechanism will likewise act gradually upon the warp beam. It will also be seen that in the arrangement of the let-off mechanism as described the warp-beam can readily be removed by lifting off the brake-beam 4. To this end the nut 12 is unscrewed from rod 10 and the spring 9 removed from said rod, the collar 12, against which the upper end of said spring abuts, being loose on said rod, as above stated. This done, the lifterrod 13 can readily be lifted off the arm of lever 14, when the brake-beam 4 can be turned up or lifted off the warp-beam.

The described let-off mechanism can be used with warp-beams of different lengths in that it is adjustable laterally or in the axial plane of the warp-beam. The saddle 3 for the lower or fixed brake-shoe 5 is to this end adj ustably secured to a cross-beam 8 by means of a setscrew 8a, said cross-beam being polygonal in section and said saddle having a projection or arm 3, provided with an opening to fit the cross-beam, as shown in dotted lines in Fig. 1. The pivot '7 of the brake-beam 4 is likewise displaceable, together with the channelrail 7, and so is the rock-lever 14 on its rockshaft 14a. The arm 14d of said lever 14, in which the push-rod 15 is stepped, has a lateral projection 14h, wherein a number of recesses or seats 14C are formed for the end of said push-rod 15, as shown in full and dotted lines in Fig. 2, both lever-arms 14d and 14e being,

angle-arms bent in opposite directions.

In order that the operation of the loom may be reversed should this become necessaryfrom any cause, I provide an angular hand-lever 24, pivoted to the saddle 3 for the lower brakeshoe 5, the short arm 26 of which lever is adapted to act upon an arm 25 on the rockshaft 14a of lever 14 in such manner that when said shaft is turned into the proper direction by the action of said hand-lever upon arm 25 said shaft will rock the lever 14 so that its arm 14e will lift the rod 13 and therethrough the brake-beam 4 and brake-shoe 6, so that the warp-beam can be revolved backward by hand. f

The brake-shoes 5 and 6 can be made of wood or of any other suitable or composite material.

Having thus described my invention, what I claim as new therein, and desire to secure by Letters Patent, is-

1. A let-off mechanism for looms comprising a stationary and a movable brake-shoe adapted to act jointly upon a warp-beam, said movable shoe held to the beam under a yielding pressure, a whip-roll revoluble in swinging bearings, a resilient support for said roll and bearings, mechanism controlled by the whip-roll and controlling the movable brakeshoe,and means for adjusting the let-off mechanism transversely of the loom-frame, for the purpose set forth.

2. The combination with a warp-beam, a stationary brake-shoe, and a movable brakeshoe acting jointly on said beam, and a spring exerting its power on said movable shoe to press the same against the warp-beam; of a whip-roll, swinging bearings therefor, a resilient support for said roll, a push-rod pivotally connected to one of said bearings, a two-armed rock-lever one of whose arms is engaged by said push-rod, an actuating-rod adapted to be moved by the other arm of said rock-lever, said actuating-rod connected with and adapted to move the movable brake-shoe against the stress of its spring, for the purpose set forth.

3. The combination with a warp-beam, a stationary brake-shoe, and a movable brakeshoe acting jointly on said beam, a spring exerting its power on the movable shoe to press the same against the warp-beam, and a regulating device for regulating the tension of said spring; of a whip-roll, swinging bearings therefor, a spring-support for said roll and bearings, a regulating device for regulating the stress of said supporting-spring, a pushrod pivotally connected to one of said bearings, a two-armed rock-lever one of whose arms is engaged by said push-rod, an actuating-rod adapted to be moved by the other arm of said rock-lever, said actuating-rod connected with and adapted to move the movable brake-shoe against the stress of its spring, for the purpose' set forth.

4. The combination with a warp-beam, a stationary and a movable brake-shoe acting jointly on said beam, the fixed rod 10 extending through an arm of the movable brakeshoe and carrying the spring 9 and nut 12 thereon, said spring having bearing on the aforesaid arm, and a lifter-rod pivotally connected thereto; of a whip-roll, swinging bearings therefor, a push-rod 15 pivotally connected with one of said bearings, a spring and fixed abutments therefor, and a two-armed rock-lever adapted to be rocked by the pushrod and to act upon the aforesaid lifter-rod, substantially as and for the purpose set forth.

5. The-combination with the brake adjustable transversely of the loom-frame, the pushrod 15 and lifter-rod 13; of the rock-lever 14 likewise adjustable transversely of the loom on its shaft 14, said lever having arms bent in opposite directions, one of said arms provided with a seat for the aforesaid lifter-rod and the other with a plurality of seats for the aforesaid push-rod, substantially as and for the purpose set forth.

6. The combination with the brake-shoe 6, the whip-roll-supporting arms 16, the actuating-rods 13 and 15 respectively connected with said brake-shoe and whip-roll-supporting arms; of the rock-lever 14 in arms of IOO which said rods are steppedfthe shaft 14: to my invention I have signed my name in pres- Which said rook-lever is secured, the radial ence of tWo subscribing Witnesses. arm 25 on said shaft and the anode-lever 24 Whose short arm has bearing onbsad radial HERMANN WOLF [L' S'] 5 arm, substantially as and foi` the purpose set Witnesses: Y

forth. I-IEINR. Lsi", In testimony that I claim the foregoing as R. FUNOK. 

